Yale New Haven Health
Disclosed Apr 11, 20251 year ago5,556,702 affectedUnverified
Cyberattack on Yale New Haven Health exposes 5.5M patients
Connecticut's largest health system said a March 2025 cyberattack let hackers copy patient names, birth dates, contact details, race and ethnicity, Social Security numbers and medical record numbers; it reported 5,556,702 affected people to HHS.
What is known
| People affected | 5,556,702 (as reported by the organization) |
|---|---|
| Disclosed | Apr 11, 2025 |
| Discovered | Mar 8, 2025 |
| Attack | Hacking |
| Data exposed | Names, Dates of birth, Addresses, Emails, Phone numbers, Social Security numbers, Health, Other |
| Sector | Healthcare · US |
| Status | Unverified: not yet confirmed by an official notice, a filing or the organization |
| Lawsuit or fine | $18M class action settlement (2025) |
Sources
| Source | |
|---|---|
| Data breach at Connecticut's Yale New Haven Health affects over 5 milliontechcrunch.com · News | News |
| Yale New Haven Health data breach affects 5.5 million patientsbleepingcomputer.com · News | News |
| April 2025 Healthcare Data Breach Reporthipaajournal.com · News | News |
| Largest Healthcare Data Breaches of 2025hipaajournal.com · News | News |
Notices filed
| Where | Filed | People |
|---|---|---|
| Researchtotal | Apr 11, 2025 | 5,556,702 |
Other breaches at Yale New Haven Health
| Breach | Affected | ||||
|---|---|---|---|---|---|
| Disclosed Nov 8, 2019Nov 8, 20196 years ago | Nov 8, 20196 years ago | Not stated | Healthcare | Confirmed | 27K |
History of this record
- 2026-09-25 · added · seed source
First seen 2026-09-25 (Research). Record counts are as reported. Not legal advice.